I would argue that selling a product that engineers need to create and maintain at great cost to the company (both monetary and in terms of frustration etc) and customer relations is in fact incompetence.

or at least that’s how I see if from my own dealings with the sales guy at work. “okay yes I see you have an idea, but can we nail down a product definition, describe where we add value, and identify how it is different than these two other globally established products on the market right now?” nope, all he could do was be a little bitch about it. apparently he had customers lined up, though.